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A gunman suspected of fatally shooting an Alabama聽school bus driver before holing up in an underground bunker with a young child is a聽Vietnam聽veteran with anti-government views, authorities and an organization that tracks hate groups said on Wednesday.

Law enforcement officials from multiple agencies were bivouacked near the bunker in聽Midland City聽but offered few details about a standoff with the shooter that stretched into its second day on Wednesday.

Authorities said driver聽Charles Albert Poland Jr., 66, was killed after the gunman boarded a bus ferrying more than 20 children home from school on Tuesday.

The suspect demanded the driver let a student off the bus, Alabama聽media reported. When聽Poland聽refused, the man boarded the bus and shot the driver before taking a 6-year-old kindergarten student and fleeing the scene.

The shooting and subsequent hostage drama came as a national debate rages over gun violence, especially in schools, after a gunman shot dead 20 students and six staff members at a聽Connecticut聽elementary school last month.

In Alabama聽on Wednesday night, the suspected gunman remained holed up with the boy in the underground bunker on his property down a dirt road. Any efforts to negotiate with the man, or to stage a hostage rescue operation, were shrouded in secrecy with authorities declining to comment.

Television images showed security force officers, clad in camouflage uniforms and brandishing assault rifles, patrolling the area.

An Alabama聽legislator, Representative聽Steve Clouse, told reporters the hostage suffered from Asperger's Syndrome and ADHD but had apparently been able to receive his medication while held captive. The聽Dale County Sheriff's Department聽said the child was not believed to have been harmed.

Schools in the area of the Alabama聽shooting were closed on Wednesday and will remain shuttered for the rest of the week.聽

Driver hailed as hero聽

Dale County Superintendent聽Donny Bynum聽lauded聽Poland聽as "a hero ... who gave his life to protect 21 students who are now home safely with their families."

The superintendent's assistant said the young boy still being held by the gunman appeared to have been chosen at random.

"Emotions are high, and it's a struggle聽for us all聽to make sense of something so senseless, but let us keep this young student, his family and Mr.聽Poland's family in our thoughts and prayers," Bynum said in a statement.

The Southern Poverty Law Center reported on its Hatewatch blog that a chief investigator with the Dale County Sheriff's Office identified the gunman as 65-year-old聽Jimmy Lee Dykes, although Reuters could not independently verify the gunman's identity.

Investigator聽Tim Byrd聽said Dykes' friends and neighbors described him as a "survivalist" who did not trust the government, according to the law center blog.

"He was standoffish, didn't socialize or have any contact with anybody," Byrd told Hatewatch.

Dykes had not been on the law center's radar before the shooting and standoff, and there was nothing to suggest he was a member of any hate group, said senior fellow聽Mark Potok.

"What it looks like is that he's some kind of anti-government radical and survivalist," Potok told Reuters. "And exactly what that means, we don't know."

Court records show Dykes had been due to appear for a bench trial on Wednesday following his arrest last month on a menacing charge.

James Edward Davis, a neighbor of Dykes, told CNN the arrest stemmed from an incident on Dec. 10 when Dykes pulled a gun on him and his young daughter. According to Davis, Dykes was upset because he believed Davis had driven onto his property. Dykes fired two gunshots as Davis sped off in his car, he said.

"This man has been an accident waiting to happen. He's been a ticking time bomb,"聽Ronda Wilbur, another neighbor of Dykes, told CNN, complaining he had killed her family dog by beating it with a lead pipe and then bragged about it to her husband.

"He got increasingly more bizarre. He spent most of the last two years moving concrete blocks around and digging, constantly digging and moving dirt," she said of Dykes.

Wilbur and other neighbors said Dykes had moved into the area about two years ago and kept mostly to himself.

(Reporting by Kaija Wilkinson in Mobile, Alabama; Additional reporting and writing by Colleen Jenkins; Editing by Tom Brown, Andrew Hay and Lisa Shumaker)